Bar stool



FIG. 1 is a front perspective view of a bar stool;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right elevation view thereof; and,

FIG. 7 is a left elevation view thereof.

The broken lines in the drawings illustrate portions of the bar stool that form no part of the claimed design. 

CLAIM The ornamental design for a bar stool, as shown and described. 